Abstract The fragmentation effect of PELE refers to the fragmentation of the jacket after PELE penetrates the metal target plate. Three sets of 30CrMnSiA tensile samples with different hardness were pulled to obtain the corresponding maximum principal tensile stress and fracture strain of the material. It was found that the greater the hardness, the smaller the fracture strain, and the more easily to shear failure; Then, PELE penetration metal thin target fragment recovery test was carried out. It was found that only HRC50 jacket had compression shear and other brittle material damage characteristics and produced ideal fragmentation effect during penetration; The results show that the greater the target velocity is, the greater the critical value of its own material breaking is. When its own breaking strain is less than the critical value, the jacket can play a fragmentation effect; For PELE penetrator with the same material performance that meet the crushing conditions, the greater the impact velocity, the more the number of jacket fragments and the larger the distribution radius of fragments. plate CrMnSiA failure Then out HRC HRC5 conditions

ABSTRACT The constant strain rate loading and dynamic stress equilibrium are prerequisites for ensuring the experimental data of the Split Hopkinson Pressure Bar (SHPB). In order to achieve this requirement, a proper pulse shaper dimensions were used in the experiment. For this purpose, the pulse shaper diameter, thickness and strength and the strike bar length and its velocity on the incident pulse are studied by ∅80mm SHPB apparatus. Then, the parameters affecting the two key inflection points and three loading areas of the incident pulse are discussed. In addition, the improved methods for two typical non-constant strain rate waveforms for the concrete experiments are obtained based on the regular pulse shaping. Moreover, SHPB experiments are conducted for concrete by employing different pulse shaper dimensions. The results show that more valid data can be obtained by employing the pulse shaper with large thickness when the strain rate is non-constant during the experiment. The conclusions and method provide guidance for selecting pulse shaper for concrete SHPB experiments.

Abstract PELE (the Penetrator with Enhanced Lateral Effect) produces a large number of fragments after penetrating metal target plate, which can damage the high-value targets behind the shield plate in a large area. However, when facing the multi-layer spaced metal shield plates, it is difficult to penetrate them and damage the targets behind them due to the limited penetration ability of the fragments. Radial layered PELE was designed for damaging multi-layer spaced metal plates. The experiment and numerical simulation were carried out to study the deformation and fragmentation of the penetrator after penetrating 2A12 aluminum alloy or Q235 steel target plate at different velocities, as well as the damage to the witness plates after penetrating the main target plates. The results show that the fragmentation of PELE increases with the increase of impact velocity. At the same impact velocity and the same thickness of metal target plate, compared with penetrating the 2A12 aluminum alloy target plate, radial layered PELE is deformed and broken to a greater extent, resulting in heavier damage to the witness plates when penetrating the Q235 steel target plate. In the process of penetrating multi-layer metal target plates, the outer jacket of radial layered PELE is gradually broken to form a large number of flying fragments, but the inner jacket is difficult to deform and break, resulting in the strong penetration ability of the penetrator. Therefore, radial layered PELE has better penetration and damage capacity than non layered PELE.

Abstract The perforation tests of 45 # steel target plate and 2A12 aluminium alloy target plate by PELE (the Penetrator with Lateral Efficiency) were carried out in this paper to study the perforation failure characteristics of metal target plate. The macroscopic morphology of perforation on the target plate and the plug was observed, and the perforation wall was cut and polished to observe the distribution and trend of the cracks in the perforation wall by scanning electron microscopy (SEM) and metallographic microscopy. The magnitude and direction of the force produced by PELE on the target during penetration were calculated by numerical simulation. The experimental and numerical results show that, the perforation failure of metal target plate by PELE is different from the ductile perforation by conical-nosed projectile and the punching failure by flat-nosed projectile. The longitudinal cross section of the perforation is funnel-shaped and the shape of the plug is like a circular truncated cone. In the process of penetrating the target plate, the expansion of the filling causes the jacket to exert a force with a certain angle to the direction of projectile movement, which is the main reason for the funnel-shaped perforation and the circular truncated cone shaped plug.

Abstract In order to study the critical ricochet velocity and critical penetration velocity of tungsten alloy rod obliquely penetrating a finite-thickness metal plate, experiment and numerical calculation of tungsten alloy rod impacting on homogeneous armor steel plate with a thickness of 30mm at an angle of 60° were carried out. Compared the experimental and numerical results with the results using models, it is found that, the results of the ricochet models proposed by Tate, Rosenberg and Steven B for semi-infinite thick plate are quite different from those of experiment and numerical calculation, so they can not be applied to the ricochet situation of finite-thickness plate. The critical penetration velocity model proposed by De Marre and Zhao are in good agreement with the numerical and experimental results, which can predict critical penetration velocity of tungsten alloy rod obliquely penetrating a finite-thickness metal plate with large impact angle. The penetration depth of the projectile under the critical ricochet velocity is about 1/3 of the thickness of the target plate, and the angle between the ejection trajectory of the fragments produced by projectile and target plate and projectile penetration trajectory is exactly 90° in the first penetration stage.

Abstract: Stable isotopes of oxygen (δ18O) and hydrogen (δD) in water were used as important indicators to research the hydrologic cycle or processes. To study the hydrologic cycle characteristics of the Jinxiuchuan basin, the isotope labelling and the industrial salt tracing method were used in this research. Sixty-seven samples of different water bodies were collected at different sampling sites from July 2011 to July 2012. The stable hydrogen and oxygen isotopes in water samples were measured by using Liquid Water Isotope Analyzer (LWIA-24d) to study the conversion relationship among precipitation, river water, soil water, and groundwater of the Jinxiuchuan basin in Jinan. The results show that δD and δ18O varied from 35.6 ‰ to 128.3 ‰ and from 5.3 ‰ to 17.5‰, respectively. A meteoric water line of δD = 7.16δ18O + 4.35‰, which was in accordance with the global meteoric water line and the meteoric water line of China, was established in the Jinxiuchuan basin. The deuterium excess values vary with time and space, ranging from 5.1 to 22.3‰, and increase gradually from the southeast to the northwest. In addition, the exchange of different water bodies was determined preliminarily, the rates of precipitation transforming into river water, soil water, and groundwater are 43.76%, 21.91% and 6.84%, and the remaining is 27.49% returned to the atmosphere. The results indicated the hydrologic cycle characteristics in the Jinxiuchuan basin. It may provide the references for precipitation isotopes research in semi-humid regions.

Resumen: Se emplearon isótopos estables de oxígeno (δ18O) e hidrógeno (δD) en agua como indicadores importantes para comprender el ciclo hidrológico o sus procesos. Para comprender las características del ciclo hidrológico en la cuenca de Jinxiuchuan, en este estudio se empleó el método de marcaje isotópico y la técnica de trazabilidad de sal industrial. Se tomaron 67 muestras de distintos cuerpos de agua en diferentes sitios de muestreo de julio de 2011 a julio de 2012. Se midieron los isótopos estables de hidrógeno y oxígeno en las muestras de agua mediante el uso del Analizador de Isótopos en Agua Líquida (LWIA-24-d) para examinar el vínculo entre la precipitación, el agua de río, el agua de suelo y el agua subterránea de la cuenca de Jinxiuchuan, en Jinan. Los resultados muestran que δD y δ18O variaron de 35.6 ‰ a 128.3 ‰ y de 5.3 ‰ a 17.5 ‰, respectivamente. La línea de agua meteórica se estableció en la cuenca de Jinxiuchuan, por ejemplo δD=7.16δ18O+4.35 ‰, lo cual concordó con la línea de agua meteórica global y la línea de agua meteórica de China. Los valores de exceso de deuterio varían en el tiempo y el espacio, entre 5.1 y 22 ‰, e incrementan gradualmente del sudeste al noroeste. Asimismo, se determinó preliminarmente el intercambio de distintos cuerpos de agua; los índices de precipitación que se transformó en agua de río, agua de suelo y agua subterránea son de 43.76%, 21.91% y 6.84%, y el restante 27.49% regresó a la atmósfera. Los resultados indicaron las características del ciclo hidrológico en la cuenca de Jinxiuchuan, las cuales tienen valor de referencia para la investigación de isótopos en la precipitación en regiones semihúmedas.